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POSIX® 1003.1 Frequently Asked Questions (FAQ Version 1.15)

http://www.opengroup.org/austin/papers/posix_faq.html

Shell Command Language Index http://pubs.opengroup.org/onlinepubs/007908799/xcu/shellix.html
Linux man pages online

https://www.kernel.org/doc/man-pages/
http://man7.org/linux/man-pages/index.html
Base Definitions: Detailed ToC
http://pubs.opengroup.org/onlinepubs/9699919799/basedefs/contents.html
The Unix and Internet Fundamentals HOWTO

http://www.tldp.org/HOWTO/Unix-and-Internet-Fundamentals-HOWTO/index.html

How To Become A Hacker
http://www.catb.org/~esr/faqs/hacker-howto.html

How Computers Boot Up http://duartes.org/gustavo/blog/post/how-computers-boot-up/
How PCs Work http://computer.howstuffworks.com/pc3.htm http://computer.howstuffworks.com/pc7.htm

What happens when you switch on a computer?
http://www.tldp.org/HOWTO/Unix-and-Internet-Fundamentals-HOWTO/bootup.html

Compiling Linux Software from Source Code

http://www.control-escape.com/linux/lx-swinstall-tar.html